package tripleo.nio.javanio;

/*
 * @(#)RequestServicer.java	1.2 04/07/26
 * 
 * Copyright (c) 2004 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * -Redistribution of source code must retain the above copyright notice, this
 *  list of conditions and the following disclaimer.
 * 
 * -Redistribution in binary form must reproduce the above copyright notice, 
 *  this list of conditions and the following disclaimer in the documentation
 *  and/or other materials provided with the distribution.
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of contributors may 
 * be used to endorse or promote products derived from this software without 
 * specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any kind. ALL 
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
 * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN")
 * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
 * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST 
 * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, 
 * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY 
 * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, 
 * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 * 
 * You acknowledge that this software is not designed, licensed or intended
 * for use in the design, construction, operation or maintenance of any
 * nuclear facility.
 */

import java.io.IOException;
import java.nio.ByteBuffer;

import tripleo.nio.javanio.http.*;


/**
 * Primary driver class used by blocking Servers to receive,
 * prepare, send, and shutdown requests.
 *
 * @author Mark Reinhold
 * @author Brad R. Wetmore
 * @version 1.2, 04/07/26
 */
class RequestServicer implements Runnable {

	private ChannelIO cio;

	private static int created = 0;

	RequestServicer(ChannelIO cio) {
		this.cio = cio;

		// Simple heartbeat to let user know we're alive.
		synchronized (RequestServicer.class) {
			created++;
			if ((created % 50) == 0) {
				System.out.println(".");
				created = 0;
			} else {
				System.out.print(".");
			}
		}
	}

	private void service() throws IOException {
		Reply rp = null;
		try {
			ByteBuffer rbb = receive();		// Receive
			Request rq = null;
			try {				// Parse
				rq = JN_Request.parse(rbb);
			} catch (MalformedRequestException x) {
				rp = new Reply(Reply.Code.BAD_REQUEST,
				        new StringContent(x));
			}
			if (rp == null) rp = build(rq);	// Build
			do {} while (rp.send(cio));		// Send
			do {} while (!cio.shutdown());
			cio.close();
			rp.release();
		} catch (IOException x) {
			String m = x.getMessage();
			if (!m.equals("Broken pipe") &&
			        !m.equals("Connection reset by peer")) {
				System.err.println("RequestHandler: " + x.toString());
			}

			try {
				/*
				* We had a failure here, so we'll try to be nice
				* before closing down and send off a close_notify,
				* but if we can't get the message off with one try,
				* we'll just shutdown.
				*/
				cio.shutdown();
			} catch (IOException e) {
				// ignore
			}

			cio.close();
			if (rp != null) {
				rp.release();
			}
		}
	}

	public void run() {
		try {
			service();
		} catch (IOException x) {
			x.printStackTrace();
		}
	}

	ByteBuffer receive() throws IOException {

		do {} while (!cio.doHandshake());

		for (; ;) {
			int read = cio.read();
			ByteBuffer bb = cio.getReadBuf();
			if ((read < 0) || (JN_Request.isComplete(bb))) {
				bb.flip();
				return bb;
			}
		}
	}

	Reply build(Request rq) throws IOException {

		Reply rp = null;
		JN_Request.Action action = rq.action();
		if ((action != JN_Request.Action.GET) &&
		        (action != JN_Request.Action.HEAD))
			rp = new Reply(Reply.Code.METHOD_NOT_ALLOWED,
			        new StringContent(rq.toString()));
		else
			rp = new Reply(Reply.Code.OK,
			        new FileContent(rq.uri()), action);
		try {
			rp.prepare();
		} catch (IOException x) {
			rp.release();
			rp = new Reply(Reply.Code.NOT_FOUND,
			        new StringContent(x));
			rp.prepare();
		}
		return rp;
	}
}
